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Date: Mon, 6 Aug 2007 12:16:11 -0700 (PDT)
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On Mon, 6 Aug 2007, Andrew Morton wrote:

> Plus I don't think there are many flags left in the upper 32-bits.  ia64
> swooped in and gobbled lots of them, although it's not immediately clear
> how many were consumed.

IA64 uses one of these bits for the uncached allocator.  10 bits used for 
the node. Sparsemem may use some of the rest.